Folks, I got this running with windows built in w32tm and a scheduled task (see below).
First step was to config w32tm to use many different time servers (and also to log so we could see what was happening).
Second step was to schedule w32tm in task scheduler. I liked this solutions as it didn't require any 3rd part tools. It is really important to set up the different time servers as I find quite often they don't respond.
Open Command prompt (Run as admin)
w32tm /config /manualpeerlist:"time.nist.gov time.windows.com time-nw.nist.gov time-a.nist.gov time-b.nist.gov time-a.timefreq.bldrdoc.gov time-b.timefreq.bldrdoc.gov time-c.timefreq.bldrdoc.gov utcnist.colorado.edu" /syncfromflags:manual /update
w32tm /query /configuration
Check to see the NTP server list is updated correctly ie it reflects the peer list you have just entered
w32tm /debug /enable /file:C:\windows\temp\w32time.log /size:10000000 /entries:300 Browse to directory and check to see the log has been created
Change system time manually(so that the time is now out of sync), then go back to command prompt and run the resync command
Check system time has been updated. **If you get an error about the time service not being started you can use the command “net start w32time” then try another resync
If this works successfully then all you have to do is configure the following scheduled task to run as often as you want (it will use your peer list configured above).
%windir%\system32\sc.exe start w32time task_started